actual
ascertained
attested
authenticated
categorically true
certain
certified
confirmed
corroborated
demonstrated
determined
documentary
effectual
established
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historical
not in error
objectively true
proved
real
substantiated
sure-enough
true
true as gospel
truthful
unanswered
uncontradicted
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undenied
undoubted
unerroneous
unfallacious
unfalse
unmistaken
unquestionable
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validated
veracious
verified
veritable